Pablo Neira Ayuso | 7c62234 | 2012-06-19 02:10:57 +0200 | [diff] [blame] | 1 | /* |
| 2 | * (C) 2012 by Pablo Neira Ayuso <pablo@netfilter.org> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License version 2 as |
| 6 | * published by the Free Software Foundation. |
| 7 | * |
| 8 | */ |
| 9 | |
| 10 | #include <linux/skbuff.h> |
| 11 | #include <linux/netfilter.h> |
| 12 | #include <linux/netfilter/nfnetlink.h> |
| 13 | #include <linux/netfilter/nfnetlink_queue.h> |
| 14 | #include <net/netfilter/nf_conntrack.h> |
Pablo Neira Ayuso | ab5e8b7 | 2012-06-22 11:25:33 +0200 | [diff] [blame] | 15 | #include <net/netfilter/nfnetlink_queue.h> |
Pablo Neira Ayuso | 7c62234 | 2012-06-19 02:10:57 +0200 | [diff] [blame] | 16 | |
| 17 | struct nf_conn *nfqnl_ct_get(struct sk_buff *entskb, size_t *size, |
| 18 | enum ip_conntrack_info *ctinfo) |
| 19 | { |
| 20 | struct nfq_ct_hook *nfq_ct; |
| 21 | struct nf_conn *ct; |
| 22 | |
| 23 | /* rcu_read_lock()ed by __nf_queue already. */ |
| 24 | nfq_ct = rcu_dereference(nfq_ct_hook); |
| 25 | if (nfq_ct == NULL) |
| 26 | return NULL; |
| 27 | |
| 28 | ct = nf_ct_get(entskb, ctinfo); |
| 29 | if (ct) { |
| 30 | if (!nf_ct_is_untracked(ct)) |
| 31 | *size += nfq_ct->build_size(ct); |
| 32 | else |
| 33 | ct = NULL; |
| 34 | } |
| 35 | return ct; |
| 36 | } |
| 37 | |
| 38 | struct nf_conn * |
| 39 | nfqnl_ct_parse(const struct sk_buff *skb, const struct nlattr *attr, |
| 40 | enum ip_conntrack_info *ctinfo) |
| 41 | { |
| 42 | struct nfq_ct_hook *nfq_ct; |
| 43 | struct nf_conn *ct; |
| 44 | |
| 45 | /* rcu_read_lock()ed by __nf_queue already. */ |
| 46 | nfq_ct = rcu_dereference(nfq_ct_hook); |
| 47 | if (nfq_ct == NULL) |
| 48 | return NULL; |
| 49 | |
| 50 | ct = nf_ct_get(skb, ctinfo); |
| 51 | if (ct && !nf_ct_is_untracked(ct)) |
| 52 | nfq_ct->parse(attr, ct); |
| 53 | |
| 54 | return ct; |
| 55 | } |
| 56 | |
| 57 | int nfqnl_ct_put(struct sk_buff *skb, struct nf_conn *ct, |
| 58 | enum ip_conntrack_info ctinfo) |
| 59 | { |
| 60 | struct nfq_ct_hook *nfq_ct; |
| 61 | struct nlattr *nest_parms; |
| 62 | u_int32_t tmp; |
| 63 | |
| 64 | nfq_ct = rcu_dereference(nfq_ct_hook); |
| 65 | if (nfq_ct == NULL) |
| 66 | return 0; |
| 67 | |
| 68 | nest_parms = nla_nest_start(skb, NFQA_CT | NLA_F_NESTED); |
| 69 | if (!nest_parms) |
| 70 | goto nla_put_failure; |
| 71 | |
| 72 | if (nfq_ct->build(skb, ct) < 0) |
| 73 | goto nla_put_failure; |
| 74 | |
| 75 | nla_nest_end(skb, nest_parms); |
| 76 | |
| 77 | tmp = ctinfo; |
| 78 | if (nla_put_be32(skb, NFQA_CT_INFO, htonl(tmp))) |
| 79 | goto nla_put_failure; |
| 80 | |
| 81 | return 0; |
| 82 | |
| 83 | nla_put_failure: |
| 84 | return -1; |
| 85 | } |
| 86 | |
| 87 | void nfqnl_ct_seq_adjust(struct sk_buff *skb, struct nf_conn *ct, |
| 88 | enum ip_conntrack_info ctinfo, int diff) |
| 89 | { |
Patrick McHardy | 41d73ec | 2013-08-27 08:50:12 +0200 | [diff] [blame] | 90 | struct nfq_ct_hook *nfq_ct; |
Pablo Neira Ayuso | 7c62234 | 2012-06-19 02:10:57 +0200 | [diff] [blame] | 91 | |
Patrick McHardy | 41d73ec | 2013-08-27 08:50:12 +0200 | [diff] [blame] | 92 | nfq_ct = rcu_dereference(nfq_ct_hook); |
| 93 | if (nfq_ct == NULL) |
Pablo Neira Ayuso | 7c62234 | 2012-06-19 02:10:57 +0200 | [diff] [blame] | 94 | return; |
| 95 | |
| 96 | if ((ct->status & IPS_NAT_MASK) && diff) |
Patrick McHardy | 41d73ec | 2013-08-27 08:50:12 +0200 | [diff] [blame] | 97 | nfq_ct->seq_adjust(skb, ct, ctinfo, diff); |
Pablo Neira Ayuso | 7c62234 | 2012-06-19 02:10:57 +0200 | [diff] [blame] | 98 | } |
Pablo Neira Ayuso | bd07793 | 2013-08-07 18:13:20 +0200 | [diff] [blame] | 99 | |
| 100 | int nfqnl_attach_expect(struct nf_conn *ct, const struct nlattr *attr, |
| 101 | u32 portid, u32 report) |
| 102 | { |
| 103 | struct nfq_ct_hook *nfq_ct; |
| 104 | |
| 105 | if (nf_ct_is_untracked(ct)) |
| 106 | return 0; |
| 107 | |
| 108 | nfq_ct = rcu_dereference(nfq_ct_hook); |
| 109 | if (nfq_ct == NULL) |
| 110 | return -EOPNOTSUPP; |
| 111 | |
| 112 | return nfq_ct->attach_expect(attr, ct, portid, report); |
| 113 | } |